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ID <br /> Sequoia 1551 I los Cal Road <br /> San Carlos 23 -9600 <br /> (650)232-9600 <br /> FAX 0)232-9612 <br /> �W Analytical wwseq walabscom <br /> www sequoialabs com <br /> WT <br /> -Ryart/Geostrategies(1) Project Tosco(1ierra Court, Suite] Project Number Tosco#5886,Stockton,CA Reported <br /> (Dublin CA,94568 Project Manager Deanna Harding 12/06/01 16 51 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1110089-EPA 5030B IP/TJ .- <br /> Matrix Spike D u p(1110089-MSDI) Source L111140-15 Prepared&Analyzed 11/26/01 <br /> Methyl cert-butyl ether 487 10 ug11 500 ND 974 60-140 398 25 <br /> Surrogate 1,2-Dichloroelhane-d4 308 500 102 70-130 <br /> Surrogate Toluene-d8 505 500 101 70-130 <br /> Batch 1110097-EPA 5030B IP/T1 <br /> Blank(1110097-BLK1) Prepared&Analyzed 11/28/01 <br /> Ethanol ND 500 ugll <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl terl-butyl ether ND 10 " <br /> Tiftyl methyl ether ND 10 " <br /> TtqMtyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 413 Soo 826 70-130 <br /> Surrogate Toluene-d8 500 500 100 70-130 <br /> LCS(11110097-BSI) Prepared&Analyzed 11/28/01 <br /> Methyl cert-butyl ether 491 1 0 ug/1 500 982 70-130 <br /> Surrogate 12-Dtchloroethane-d4 244 250 976 70-130 <br /> Surrogate Toluene-d8 260 250 104 70-130 <br /> Matrix Spike(1110097-MS1) Source L111125-05 Prepared&Analyzed 11/28/01 <br /> Methyl tert-butyl ether 237 1 0 ug/l 250 ND 948 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 235 250 940 70-130 <br /> Surrogate Toluene-d8 253 250 101 70-130 <br /> Awilk <br /> The results in this report apply to the samples anal wed in accordance with t ha <br /> ]a Analytical San Carps p � � he chain.f <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 20 of 23 <br />